-96.86% is the change from 636 to 20
Calculation steps:
[( 20 - 636 ) ÷ 636] x 100 = -96.86%
Formula
Percentage change = [(20 - 636) / 636] x 100
Subtract the new number by the original number
20 - 636 = -616
-616 ÷ 636 = -0.9685534591194969
-0.9685534591194969 x 100 = -96.86%